12521042551 has 2 divisors, whose sum is σ = 12521042552. Its totient is φ = 12521042550.

The previous prime is 12521042533. The next prime is 12521042647. The reversal of 12521042551 is 15524012521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12521042551 - 2⁷ = 12521042423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12521042531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260521275 + 6260521276.

It is an arithmetic number, because the mean of its divisors is an integer number (6260521276).

Almost surely, 2^12521042551 is an apocalyptic number.

12521042551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521042551 is an equidigital number, since it uses as much as digits as its factorization.

12521042551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 28.

It can be divided in two parts, 125210 and 42551, that added together give a palindrome (167761).

The spelling of 12521042551 in words is "twelve billion, five hundred twenty-one million, forty-two thousand, five hundred fifty-one".